Hi there. I figured out, that after removing the language packets
thunderbird-locale-en 1:78.3.3+build1-0ubuntu0.20.10.1 thunderbird-locale-en-gb thunderbird-locale-de installed from this source http://ppa.launchpad.net/ubuntu-mozilla- security/ppa/ubuntu/ and reinstalling the 1:78.3.2+build1-0ubuntu1 packets from the official Source, fixed the problem in my case. maybe it helps?! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1901829 Title: thunderbird fails to open, xml parse error To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1901829/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs